D defs.my
Entry 2 senses Webster, 1913

Reasonless

· Rea·son·less · IPA
01 a. Destitute of reason; as, a reasonless man or mind.
  1. 1.
    Destitute of reason; as, a reasonless man or mind.
  2. 2.
    Void of reason; not warranted or supported by reason; unreasonable.
    “This proffer is absurd and reasonless.” Shak.